@inproceedings{yunfeng2017virtual,
title={Virtual Signed Euler characteristics},
author={Yunfeng Jiang, and Richard Thomas},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20190702174546710929392},
booktitle={Journal of Algebraic Geometry},
volume={26},
number={2},
pages={379-397},
year={2017},
}
Yunfeng Jiang, and Richard Thomas. Virtual Signed Euler characteristics. 2017. Vol. 26. In Journal of Algebraic Geometry. pp.379-397. http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20190702174546710929392.